The second stage of the study was
to increase fuel velocity until 30 m/s.It is clear that higher velocity
improves recirculation phenomena which are well represented by biggest
vortices (see velocity vector picture).

A rich fuel area at the top right
makes us to say that fuel pockets shed . The velocity vector picture at
the same location allows to say that it is not a vortice but only
a fuel pocket.

Moreover, at the bottom left corner,
we can see a little fuel area which. This phenomenon is certainly due to
numerical. We do not observe this numerical perturbation in the top of
the injector because of the mesh which must be different between these
two regions.